[RESOLVED] Pass data from BackgroundWorker to main thread?

Hello

In a Windows Form, I need to delegate a lengthy action to a BackgroundWorker so that the main application doesn't freeze.

However, the code in the BackgroundWorker must send data back to the main application. This code from MSDN doesn't include how to do this:

Code:

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Private Sub setTextBackgroundWorkerBtn_Click(ByVal sender As Object, ByVal e As EventArgs) Handles setTextBackgroundWorkerBtn.Click
  Me.backgroundWorker1.RunWorkerAsync()
End Sub

Private Sub backgroundWorker1_RunWorkerCompleted(ByVal sender As Object, ByVal e As RunWorkerCompletedEventArgs) _
Handles backgroundWorker1.RunWorkerCompleted
  Me.textBox1.Text = "This text was set safely by BackgroundWorker."
End Sub

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Is there a way for a BackgroundWorker object to send data back to the main app without using a global variable?

Thank you.

For others' benefit, here's some working code:

Code:

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Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        'Lengthy process here
        e.Result = "Blah"
End Sub

Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As System.Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles BackgroundWorker1.RunWorkerCompleted
    Me.RichTextBox1.AppendText(e.Result)
End Sub

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If you need more than just the final result, or regular updates from the worker thread you could also use Delegate and Invoke..

Code:

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        Delegate Sub InvokeDelegText(ByVal value As String)


    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        'Lengthy process here

            If Progress.LblProgress.InvokeRequired Then
                ' It's on a different thread, so use Invoke.
                Progress.LblProgress.BeginInvoke(New InvokeDelegText(AddressOf SetText), text)
            End If

        'Lengthy process here

            If Progress.LblProgress.InvokeRequired Then
                ' It's on a different thread, so use Invoke.
                Progress.LblProgress.BeginInvoke(New InvokeDelegText(AddressOf SetText), text)
            End If
End Sub

        Private Sub SetText(ByVal Text As String)
            Progress.LblProgress.Text = Text
        End Sub

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This code is very handy for passing any amount of data between threads.. I use it now extensively in many Multi threaded applications..